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Discharging Zinc Plate
Description: A polished zinc plate sits atop an electroscope. A negative charge is placed on the electroscope. The UV light is then shown on the plate to discharge the electroscope.
Instructions: Charge the electroscope with a negative rod (fur or waxed paper on PVC works well for a negative charge--charge by contact, not induction). Turn on the ultraviolet light. Remove the protective glass plate to expose the zinc plate to the UV rays. Replace the glass plate.
Hazards: DO NOT TURN THE UV LIGHT TOWARD THE STUDENTS.
Parts: Mercury lamp, electroscope, rods, fur, plastic
Setup Time: 15 min
Quant. in Demo Room: 1
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